Phillip Credeur, 28, killed Barbara Savant, 67, in her home on May Street on Aug. 36, 2010.
He was first charged with second-degree murder and the charged was then elevated to first-degree, a capital offense.
The multiple stabbing was related to a drug robbery, police said at the time.
Last March, Credeur’s counsel filed motions to suppress and bar introduction at trial of evidence of other crimes by Credeur.
Trial was subsequently twice postponed, most recently in November.
Credeur’s sentence from Dist. Judge Patrick Michot is without benefit of probation, parole or suspension of sentence.